1 / 19

DSP Resources

NS1000. DSP Resources. Contents. 1.1 Overview 1.2 DSP Resource Capacity 1.3 DSP Resource Usage 1.4 DSP Usage – Summary 2.1 DSP Resource Advisor 2.2 DSP Resource Reservation 2.3 DSP Usage Graph. 1.1 Overview.

ramiro
Download Presentation

DSP Resources

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NS1000 DSP Resources

  2. Contents • 1.1 Overview • 1.2 DSP Resource Capacity • 1.3 DSP Resource Usage • 1.4 DSP Usage – Summary • 2.1 DSP Resource Advisor • 2.2 DSP Resource Reservation • 2.3 DSP Usage Graph

  3. 1.1Overview • To digitally process telephone calls, the PBX must use a certain number of DSP (Digital Signal Processing) resources. • DSP resources are provided by the DSP cards installed in the PBX. • Since the DSP resources are limited, no further operations (e.g., telephone calls, playing an OGM) can be performed if all resources are in use. • The following basic operations require DSP resources. • IP extension call (To Trunk) • IP trunk call (To Ext) • Calls via IP-CS (Does not support P2P) • Conferencing • Accessing the Unified Messaging system (including recording calls) • OGM playback • Echo canceller (for trunk-to-trunk analogue calls) • Note. • For IP Ext/Trunk calls, the required DSP resource depends on the codec (Compression) used (G.711 or G.729) . • The Higher the Compression (G.729), the more DSP resource is required (but less Bandwidth) • The Lower the Compression (G711), the less DSP resource is required (but more Bandwidth) • P2P Calls (within the same P2P Group) can be considered NOT to use DSP resources. • DSP Resources are not ‘shared’ between Master/Slave systems – Calculate Resources for each PBX individually.

  4. 1.2 DSP Resource Capacity • Each optional DSP card provides a number of resources that can be called upon to provide VOIP processing when the system requires them. • (The NS1000 requires at least 1 DSP card to be installed for it to operate.) • (Up to 2 DSP cards can be installed in each NS1000, therefore the maximum DSP resource available per system is 508) In Addition to the above ‘Free’ Resources, 2 Resources are always reserved for UM Tones – not programmable.

  5. 1.3 DSP Resource Usage (1) • The required DSP Resources are calculated using the following values *1 This does not include the DSP cost of the IP-PT/Trunk using the UM Service. *2 Two-Way recording also requires a Conference Trunk

  6. 1.3 DSP Resource Usage (2) • IP Phones – “P2P” Call Setup Only P2P Communication DSP is not used at any stage of a P2P call – DSP function is taken care of within handset itself once connected. If selected compression method of phones differs, the handsets negotiate the lowest bandwidth codec of the two: (G729 > G711 > G722) 3. This applies to both SIP and IP-PT types - makes no difference

  7. 1.3 DSP Resource Usage (3) • IP-Trunk to IP-Extension DSP Cost 2.2 DSP Cost 1 NS1000 IP-Trunk G.729 G.711 IP-PT From the previous Resource table, we can calculate the DSP Resources required for the above call scenario: 2.2 + 1 = 3.2 DSP Resources Required

  8. 1.3 DSP Resource Usage (4) • Unified Messaging Access (MSG Playback) DSP Cost 1 DSP Cost 1.3 G.711 IP-PT UM Recording or playing back messages from the UM requires DSP Resource. For this example, the following DSP Resource is required: 1.3 + 1 = 2.3 DSP Resources Required • Unified Messaging Access (2-Way Rec) DSP Cost 1 + 0.5 IP-PT DSP Cost 2.3 G.711 TBC UM 2-Way Recording requires additional DSP Resource and Conference Trunk. For this scenario, the following DSP Resources are required: 2.3 + 1.5 = 3.8 DSP Resources Required IP-PT

  9. 1.3 DSP Resource Usage (5) • Conferencing (Example – 6pty conference). DSP Cost 4.4 (2.2X2) DSP Cost 1 NS1000 DSP Cost 3(6X0.5) IP-Trunk IP-Trunk G.729 (x2) G.711 IP-PT Conferencing DSP Cost 4.4 (2.2X2) DSP Cost 1 TBC Must assign 1 DSP cost for analogue Conferencing. SLT G.729 (x2) A conference requires additional resources to handle multiple voice channels. Also, in standard two-way conversations, analogue lines do not require any DSP resources, but in a conference they do. In addition, IP trunks in a conference require additional DSP resources. For this example the number of required resources are 4.4 + 4.4 + 3 + 1 + 1 = 13.8.

  10. 1.4 DSP Resource Usage - Summary • DSP Resource Summary • Accurate DSP selection is only possible when you know the maximum concurrent scenarios that will be required by the system • In most cases, IP phones used in the office will use G722 for extension to extension calls and G711 for ISDN trunk calls so DSPs are used lightly. • Typically only remote IP phones would use G729 mode. (Low Bandwidth) • SIP trunk providers can use either G711 or G729 – available bandwidth on the internet/broadband service will dictate if G711 or G729 is used. • Use the NS1000 DSP Resource tool and Usage graph to guide you to the required DSP card.

  11. NS1000 DSP Resource Advisor

  12. 2.1 DSP Resource Advisor (1) • DSP Resource Advisor • The WebMC provides a tool for calculating the number of resources required for given scenarios. • The Installer provides information such as the number of ports/resources required • (e.g., 16 extension ports using the G.729 codec) and the expected load (e.g., 50%busy), and the • resource advisor calculates the number of DSP resources required to meet those conditions. • Example: Call Centre • In a call centre, both the number of trunks and number of extensions required are likely to be high. • Also, since employees are constantly receiving calls, the system load will be high. • Additionally, calls are often recorded at call centers to provide quality-of-service monitoring.

  13. 2.1 DSP Resource Advisor (2) • Example: Call Centre (Cont..) • The Web MC DSP Resource advisor can be used to select the necessary DSP combination ‘SETTINGS’ -> PBX Configuration -> 1. Configuration -> 5. DSP Resources -> 1. Setting Select DSP Resource Advisor

  14. 2.1 DSP Resource Advisor (3) • Example: Call Centre (Cont..) • Enter the Scenario details; Select the desired DSP combination to give you enough DSP Resource. Check there is sufficient ‘Free’ Resource In this example, it can be seen that both a DSP-L (252) and DSP-S (63) will be required. (Total 315 Available Resources)

  15. 2.1 DSP Resource Advisor (4) • Example: Call Centre (Cont..) • It is possible to Apply the necessary DSP Reservation scheme from this scenario also: Recommended Resource Reservation can be applied to the system Click ‘Apply’

  16. 2.2 DSP Resource Reservation (1) • Specific resources can be reserved to guarantee a minimum level of service. • Resources reserved for a particular service (e.g., conferencing) cannot be used for another service • (e.g., Unified Messaging). i.e. You may want to reserve resources for OGM (Outgoing Message) to ensure that recorded messages can be played to incoming callers. • The resources can be reserved for the following types of services: • VoIP (G.711) • Conference trunk • Unified Messaging • Two-way Recording • OGM Example NB: UM Tone (required for 2-way recording) is reserved automatically (cannot change)

  17. 2.2 DSP Resource Reservation (2) • DSP Resource Reservation Screen ‘SETTINGS’ -> PBX Configuration -> 1. Configuration -> 5. DSP Resources -> 1. Setting Available DSP Resource DSP Resource Reservation + ‘Free’ Resource Select the time to apply the desired reservation Click OK

  18. 2.3 DSP Usage Graph • DSP usage graph • The PBX keeps a record of the maximum DSP usage per hour for each of the following features/services. • VoIP (IP trunk, IP extension and IP-CS usage) • Conference • Unified Messaging • OGM • Two-way recording • This data is displayed via the WebMC and shows trends in DSP usage over time, as well as the number of calls / operations abandoned due to lack of resources. (Up to 30 days usage is logged) • The graph allows you to confirm that sufficient resources are available, or if a larger DSP is required. ‘SETTINGS’ -> PBX Configuration -> 1. Configuration -> 5. DSP Resources -> 2. Usage EXAMPLE ONLY! Time Frame

  19. The End

More Related